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Diffstat (limited to 'spec/ruby/core/io/sysread_spec.rb')
-rw-r--r-- | spec/ruby/core/io/sysread_spec.rb | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/spec/ruby/core/io/sysread_spec.rb b/spec/ruby/core/io/sysread_spec.rb new file mode 100644 index 0000000000..1993653df9 --- /dev/null +++ b/spec/ruby/core/io/sysread_spec.rb @@ -0,0 +1,82 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "IO#sysread on a file" do + before :each do + @file_name = tmp("IO_sysread_file") + $$.to_s + File.open(@file_name, "w") do |f| + # write some stuff + f.write("012345678901234567890123456789") + end + @file = File.open(@file_name, "r+") + end + + after :each do + @file.close + rm_r @file_name + end + + it "reads the specified number of bytes from the file" do + @file.sysread(15).should == "012345678901234" + end + + it "reads the specified number of bytes from the file to the buffer" do + buf = "" # empty buffer + @file.sysread(15, buf).should == buf + buf.should == "012345678901234" + + @file.rewind + + buf = "ABCDE" # small buffer + @file.sysread(15, buf).should == buf + buf.should == "012345678901234" + + @file.rewind + + buf = "ABCDE" * 5 # large buffer + @file.sysread(15, buf).should == buf + buf.should == "012345678901234" + end + + it "coerces the second argument to string and uses it as a buffer" do + buf = "ABCDE" + (obj = mock("buff")).should_receive(:to_str).any_number_of_times.and_return(buf) + @file.sysread(15, obj).should == buf + buf.should == "012345678901234" + end + + it "advances the position of the file by the specified number of bytes" do + @file.sysread(15) + @file.sysread(5).should == "56789" + end + + it "reads normally even when called immediately after a buffered IO#read" do + @file.read(15) + @file.sysread(5).should == "56789" + end + + it "does not raise error if called after IO#read followed by IO#write" do + @file.read(5) + @file.write("abcde") + lambda { @file.sysread(5) }.should_not raise_error(IOError) + end + + it "does not raise error if called after IO#read followed by IO#syswrite" do + @file.read(5) + @file.syswrite("abcde") + lambda { @file.sysread(5) }.should_not raise_error(IOError) + end + + it "reads updated content after the flushed buffered IO#write" do + @file.write("abcde") + @file.flush + @file.sysread(5).should == "56789" + File.open(@file_name) do |f| + f.sysread(10).should == "abcde56789" + end + end + + it "raises IOError on closed stream" do + lambda { IOSpecs.closed_io.sysread(5) }.should raise_error(IOError) + end +end |